Tier 1 network

(redirected from Tier 1 Carrier)

Tier 1 network

A top-level network on the Internet. There are about a dozen Tier 1 networks, most of which are in the U.S., including AT&T, Global Crossing, Level 3, Qwest, Sprint and Verizon (originally UUNET). Known as "settlement-free peering," Tier 1 networks are private networks that allow traffic from other Tier 1 networks to transit their backbones without a fee. See peering and IXP.

Tier 2 and Tier 3 Networks Tier 2 networks peer with some networks without fees but pay to reach a large portion of the Internet. Tier 3 networks always pay fees to obtain access to the larger backbones.

ARPAnet to NSFnet to Tier 1 ARPAnet was the original Internet backbone, which was superseded by the National Science Foundation Network (NSFnet) in the late 1980s. NSFnet was replaced by Tier 1 networks in the mid-1990s when the Internet became a commercial venture. See ARPAnet, NSFnet and Internet.

Less choice: Struggling with user defections because of network bandwidth issues and availability of the popular iPhone[R] through Verizon, AT&T is making a strategic move to take out the lowest priced Tier 1 carrier.

Intec CEMS has been proven in Tier 1 carrier production environments where on average 90% of all incoming errors are applied to case logic or corrected automatically within Intec CEMS without user intervention.

Alcatel's 7330 FTTN platform has been selected as a critical triple-play enabler by a number of Tier 1 carriers worldwide, including AT&T, Swisscom and TELUS, and as such is the solution to beat in the remote DSLAM market segment.

The NexTone MSC gives Touchstone the horsepower needed to scale its network and ensure continued service quality to the industry's most demanding Tier 1 carriers," said Dan Dearing, vice president of marketing for NexTone.

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